Double document control for photographing machines



F. J. SCHUTT 2,551,468

DOUBLE DOCUMENT CONTROL FOR PHOTOGRAPHING MACHINES May 1, 1951 OriginalFiled March 30, 1944 4 Sheets-Sheet l INVENTOR y 1951 F. J. SCHUTT2,551,468

' DOUBLE DOCUMENT CONTROL FOR PHOTOGRAPHING MACHINES Original FiledMarch 30, 1944 4 Sheets-Sheet 2 F. J. SCHUTT r 2,551,468

DOUBLE DOCUMENT CONTROL FOR PHOTOGRAPHING MACHINES May 1, 1951 OriginalFiled Mafch so, 1944 4 Sheets-Sheet 5 INVENTOR Ely ATTORNEYS May 1, 1951F. J. SCHUTT 2,551,468

DOUBLE DOCUMENT CONTROL FOR PHOTOGRAPHING MACHINES Original Filed March30, 1944 4 Sheets-Sheet 4 Y INVENTOR' Patented May I, 1951 UNITED STATESOFFICE;

DOUBLE DOCUMENT coNTRoLr Rrnor GBAPHING HIN S;

Friedrich J. Schutt, Brooklyn, N. Y, assignon to em rw Ban Ilia wkiNr ar: poration of Delaware- Original application March 30-, 1944, SerialNo. 528,682. Divided and this application January 7, 1948, Serial No.895

document; feed whenever more than one docut Fig. 6 is an enlargeddetailcrossesection taken; ment is fed at one time. substantially online 6176. of Fig. l showingv the This application is; a division ofapplication double document control mechanism. Serial: No. 528,682,filed March 30, 1944, Patent, Fig. '7, is a vertical cross section takensup: No. 2,452,497 granted October-26, 1948. stantia lly c ime- 1 :1 of6.

The sheet feeding means according to the The. general constructing ofthe document present invention comprises a, pair of. feedrollphotographing machine employing the present ers, at least one ofwhich is drivable, adapted invention isv disclosed in-ccpendingapplication, and arranged to,v grip a sheet for feeding be- Serial No.528,683; filed on March 30.,'1 -9 l a tween them, one of said rollersbeing mounted Patent Number 2,377,525datedflune 5,19% and on a shaft ata point intermediate the ends the aforesaid Batent No. 2 e 52r, ,9 and:thesaid thereof, which shaft, on. the rollers encountering generalconstruction; is. illustrated and described an excessive documentthickness, is adapted and herein onlyto the extent necessary todescribe. arranged to rock about a fulcrum at or near the corela tionbetvveenthe structure disclosed one of its ends for operation bysubstantially its the respective patent and application. other end of acontrol device for interrupting The document photographing machine dis:document feed. Since the control device is more closed-intheaforementionedPatentNo. 2,4 2,4 remote from the fulcrum point of theshaft than discloses. a, frame structure for, supportin the is the feedroller of that shaft therefrom, it fol. a o s I GGQQ QSIHS 0f he mewh nhaving side lows that movement of that end of the shaft Walls at thefront. ends of the base portion for remote from the fulcrum iscorrespondingly supporting the document feed, the illuminating greaterthan the actual separation of the feed ea s, and. the CQIitrol mechanismfor, the mar. rollers thus making it possible to provide a con chine.trol which is very sensitive to varying docuht andleft-h and side;walls, I, and 2 correment thickness and, which is quick; in operation.spond to. the. side wallsshown in the aforemene.

In the drawings; 30 nned appl a ons- Th doc ment feed ma h- Fig. 1 showsthe document feed mechanism for n m has nd, P18 1 8 3 mounted in pacedDa i a document photographing machine embodying a lel relation, Qupporting a plurality of spaced. the present invention in side elevationlooking parallel arcuate guide: bars 4, Fig, 6 to provide from theright-hand side of the machine, the ed. Pa h 0? guiding QQCliIti-ehtfithereo casing of the machine being omitted for convene om t e op t hiiQm portions thereof ience in illustrating the main drive mechanism at111 di clos d n the aioresaid- B ent for the document feed. 3 52 E dplates 3 mount a, plurality 2 is an enlarged fragmentary side elevafeedshaft 5 carrying; documen ieed 5 7 5;- tion of the upper front portionof the. document. id ymounted th eon. n paced; relation and n w feedmechanism of the machine looking from the n p pheries, extending betwe nal enate left-hand side of the machine, the outer casing de bar with aportion or the periphery of; for the machine being omitted. each feedroll extending beyond the outer pee.

Fig. 3 is an enlarged fragmentary front eleiphe of uat eu de'bars. 4 forneaei gand vation with the central portion of the (10611? feeding cume tW1. h upper Su aces 9i ment feed mechanism omitted, the casing be id: ud bar E fid h flis- 5 are journalled ing omitted for illustrating theportions of the n n lat s 3 nd. at he. gh -hand e ds, main drivemechanism mounted in the side Walls DQ n g 3; the hafts project throng-.a.r 1 at the front of the machine, with the document e i n e Plat 1indi ated, at 'l V g. 1 feed control mechanism and thickness controlwhere. each shaft carries a small gear 8 re, mechanism shown in frontelevation and part, meshing with internal gear- 9 of; main dr ve of theindex mechanism being omitted for clarity. gear H1.

E g- 4 is an a ed. f gmenta y e tica seq- Mai r ve sea L6. is ri idlymounted m in tion taken substantially on line 4.4; of Big. drive shaftll extending; transversely across the l o n t r nside o e lethand, si oto th mach ne betweees de n 2; Walt and eyon the Q ite s de hereoia.shown Fi 5'15 a nl rged ra menta y e ti al; s c;

on aken ub a tiall 1 ine 5: f F1 okin ow rqlthe -esisie r; areaaremall;-

Fig. 1. A main drive pulley I2 is driven by an electric motor, notshown, through belt I3. Pulley I2 is mounted on a stub-shaft carried byside wall I and carries a pinion I4 intermeshing with gear I5 mounted onanother stub-shaft carried by side wall I and having clutch controlleddriving connection with gear I6 intermeshing with the external gearteeth I! on main drive gear I 0.

The clutch control for the driving connection between gears I5 and I6has a pair of clutch collar operating arm I8 carried by rod I9 rotatablymounted in bearing bracket secured to the outer side of the side wall I.A lever 2I is mounted on the end of rod I9 at the opposite side of thebearing from clutch collar operating arms I8, as shown in Fig. 1, andhas the free end thereof connected with the armature of solenoid 22. Theclutch is disengaged when the solenoid is energized. When solenoid 22 isnot energized a coil spring 23 having opposite ends secured to lever 2!and side wall I respectively, as shown in Fig. 1, operates lever 2I torotate rod I9 and maintain the clutch in engaged relation for drivingmain drive gear II) in the rotation v of main drive pulley I2 by themotor.

Upper and lower document guide units, seen in dotted lines in Fig. 1 at24 and 25 respectively, have a plurality of arcuate guide bars 26mounted in spaced parallel relation between and supported by end members21. Upper and lower guide units 24 and 25 carry a plurality of feedshafts 28 each mounting a plurality of document feed rolls 29 arrangedto have the peripheries thereof extend between guide bars 26 in registrywith feed rolls 6. As described in the aforesaid Patent No. 2,452,497the guide units 24 and 25 define a path of travel through which adocument to be photographed is fed into and through the photographingposition by the cooperating sets of rollers 6 and 29 which (with theexception of the top, or leading set of those rollers, which mayconveniently be regarded as the entrance rollers and which are thoseshown in the instant disclosure), are spring loaded into peripheralengagement for gripping and thereby feeding a document engaged betweenthem through the path defined by the guide units.

A supporting rod 30 extends through the upper front corners of upperguide member 24 and has the free ends detachably-engaged in openings inside walls I and 2 for pivotally supporting upper guide member 24 intransversely extending relation between side walls I and 2. A suitablelatch member having latch rods 3! secures the lower rear end of upperguide member 24 in operative position, as shown in Fig. 1. A pair ofsupporting rods 32 engaged in transversely extending relation throughend members 21 of the lower guide member 25 removably mounts the lowerguide member in operative position between side walls I and 2. Endplates 3 have projecting portions mounted on a supporting rod secured atopposite ends in side walls I and 2 as shown in Patent No. 2,452,497.The right-hand end plate 3 has an aperture in the central portion forengagement over a supporting stud carried by a portion of side wall Iprojecting toward main drive shaft II as indicated in Fig. 1 at I. Thisprovides for detachable mounting of the main document feed unit betweenside walls I and 2. The path for feeding documents is arranged inconcentric relation to main drive shaft II having roller bearingmountings in end plates 3. Documents enter the feed unit at the top asindicated at A, Fig.

1, and after passing through a semi-circular path past the photographingposition are discharged at the bottom of the unit at B.

The double document control mechanism which is the essential feature ofthe present invention is associated with the shafts 5 and 25. Theentrance rollers 6 and 29 on their respective shafts 5 and 29, asdistinct from the remaining cooperating groups of such rollers on theother shafts forming part of the document guide units 24 and 25, aredeliberately spaced so that there is clearance between their registeringbut non-contacting peripheries. The shafts 5 and 28 furthermore differfrom the other shafts in that the uppermost feed shaft 5 of the mainfeed unit is provided in the central portion of its length with a centermetallic feed roll 64 as shown in Fig. 6, whereas the upper feed shaftin the upper guide unit 24 arranged in paired relation with the shaft 5has a centrally located metallic feed roll 65 thereon for peripheralengagement with feed roll 64 while the remaining feed rolls on thisupper shaft do not have peripheral engagement with the correspondingfeed rolls 6, as shown in Fig. 6. Opposite ends of the uppermost feedshaft 28 are mounted in bearing sleeves 66 carried by slidable blocks 6!engaged between the spaced plates of end members 21. Guide slots 68 inthe plates of end members 2! slidably mount bearing sleeves 66 formovement of the shaft 28 with its rollers 29 and 65 towards and awayfrom the shaft 5 with its rollers 6 and 64 and laterally extending pins69 project laterally outwardly through the guide slots 68 in end members21.

At the right side of the machine the free end of pin 69 engages one endof a bell crank lever I0 pivoted at II on a stud projecting inwardlyfrom the inner face of side wall I while the upper end of bell crank IDhas a projection I2 engaging a thickness control cam I3. Thicknesscontrol cam I3 is mounted on the inner end of an adjusting shaft I4having the central portion rotatably mounted in a bracket I5 secured tothe outer face of side wall I. The outer end of adjusting shaft I4carries a member I6 adapted for manual rotation to adjust the positionof eccentric I3. A ratchet wheel 1 I is mounted adjacent the inner endof member I6 and has the free end of a spring actuated pawl I8resiliently engaged therewith for normally holding adjusting shaft I4against rotation. Pawl I8 is pivotally mounted on bracket I5, as shownin Fig. 7.

There are ten teeth on ratchet wheel I! in order that pawl I8 willoperate to normally hold the ratchet wheel against rotation by member ISin a predetermined position for each adjacent pair of teeth until thespring pressure of pawl I8 is manually overcome by positive manualrotation of member I6. Member I6 is in the form of an annular dischaving a knurled periphery, as shown in Fig. 3, with a cylindricalportion adjacent the disc provided with indicia at I9 showing theposition of thickness adjustment of member I6. The numerals indicatingthe adjustment run from one to ten and represent thickness adjustmentsfor sheets determining positions of adjustment where sheets of differentthickness will be either fed through the machine or prevented from beingfed by stopping the feed.

A bell crank lever 80, Fig. 5, is pivoted against the inner side ofright-hand side wall I in front of the upwardly extending arm of bellcrank lever ID, as shown in Fig. 5, on a stud projecting assumesinwardly from side. wall. I. One. arm of bell: crank;

80 extends upwardly and has a pin 81. on the. upper end extending.laterally and, engaging, the forward edge. of the. upwardly extending.arm of bell crank 10. The other arm of bell crank 80 extends rearwardlyand has one. end of, a. coil. spring 8.2 connected to the end thereof.The opposite end of coil spring 82' is. connected to one. end of lever83 extending radially from document straightening shaft 84 carryingdocument straightening fingers 85 for engaging the leading edge of adocument immediately after. it is fed. into the feed mechanism betweenrolls 64 and 6 5. It will be noted. that the periphery of the roll 65is. convexly arcuate, having line.

contactv with the upper force of a. document engaged between it and theroll 64. Thus, if a document. is fed between the rolls 6.4 and 65. withits leading edge not truly transverse to the direction of feed, the moreadvanced end. of the leading edge willengage. the straightening. fingersat. that end to be momentarily arrested. Meanwhile the line contact ofthe roll 65 with the. document. permits. it to. swing until the entireleading edge engages all of the fingers. 85 when further feeding of thedocument will move fingers 85 and rock shaft 84 against the tension ofspring 82 until. the straightened document passes. under the ends of thefingers. The straightened docu ments will then be guided through thefeedmechanism with the leading edges in transversely extending relation.Coil spring 82 also. operates. simultaneously to maintain. bell crank 86with pin 81 in engagement with the upper end of bell crank 10 formaintaining projection 12 in constant engagement with the surface ofeccentric 13. The lower end of bell: crank 10 extends rearwardly and therear free thereof engages above laterally extending pin 69- at therighthand sideof the machine on slidable block 61' for holding theslidable block against upward movement. The spring 82, being operativelyconnected between the bell crank 8E! and the lever 83 which mounts thestraightening finger shaft 84, has an additional function. In thatrespect, as will be seen from Fig. 5, anti-clockwise rotation of the cam13 to set the double document control to accommodate thicker documentsas will later be described, swings the bell crank 1G clockwise about itspivot TI and, since the upper end of the bell crank Hi engages the pinSI of the bell crank 80, it follows that bell crank Bil also. thenswings clockwise about its pivot, thereby increasing the tension in thespring 82. Thus the tension of spring 82 increases correspondingly withthe setting of the double document control to accommodate thickerdocuments, thereby tending to prevent premature release of thestraightening fingers such as might otherwise occur when controlling thefeed of thick documents.

As seen in Figs. 6 and '7 the control wheel 16 is set to accommodateonly a single thickness relatively thin document. At that setting shouldoverlapping documents be engaged between the feed rolls 64 and 65 theexcessive document thickness will, tend to lift the shaft as a whole butsince there is negligible if any clearance between the right hand pinE91 and the under side of the rearwardly extending arm of the bell cranklever 10 the shaft will in effect rock about the fulcrum pointconstituted by the pin contacting portion of the lower edge of the said,rearwardly extending arm of. the bell crank it]. Since the right-handpin 6'9 can then rise no further, rocking of the shaft. due. to theexcessive document. thickness;

thenmanifests itself as rising movement at the left-hand. end. of theshaft. 28; and. furthermore since. the. roller. 6 5 is. approximatelymidway along the shaft 28, the; left. end. half ofthe shaft, due to.its. greater distance. from the. fulcrum. point; rises to. aconsiderably reater extent than. the

thickness of. the. engaged documents... The rising.

movement: of; the. pin 69. at the left-hand end. of theshaftzeisutilized to operate switch control bell crank 86 pivotallymounted. onbracket. 81; on. the. outside face. of leftehand. sidewall. 2. A

short substantially horizontally extendin arm 88.

on bell crank, 86. extends. inwardly through an opening in side, wall '2and is. formed with. an.

extension for engagement. with. the top peripheral portion of theprojection 69 on; left-hand slide block; 61,, Fig. 6. A coil spring 89secured at. ne end to short arm 88 of bell, crank 86 and at; the,

. opposite endto a stud on the inner face of side wall 2; firmlymaintains the end of arm 88 engaged with left-hand projection 69 tomaintain feed and control roll 65 in resilient. rolling contact withroll 64. The other arm 90' of bell crank 8,6 extends upwardly along theoutside of left-hand side wall 2, as shown in Figs. 3 and 6, and has.the free end provided with a. lateral projection for engaging the.operating pin of micro-switch 9| mounted on the upper portion of bracket81, as. shown in Figs. 2, 3 andfi.

In the counter-clockwise rotation of bell crank. 86 through the raisingof pin 69- by a document, engaging between feed and control rolls 64 and65. it will be seen that by controlling the position of the fulcrum forupper shaft 28 at the right-hand end, the amount of vertical, movementat the left-hand endv of the control shaft can. be utilized to actuatemicro-switch 9| to close the circuit thereto and actuate control. means.for stopping the feed of documents. whenever the documentthickness isgreater than the amount. for which the knob 16. is set. Micro-switch.9|- is connected in the electrical circuit with solenoid 22', so that,whenever the switch is, closed,

. the solenoid will be energized to disconnect and stop the feedmechanism from operating so, that documents cannot be fed through thefeed mechanism beyond rolls 64 and 65..

If thicker documents are to be fed, the adjust mentwheel, 16 is turnedanti-clockwise as viewed in Figs. 5 and 7 to bring a correspondinglyhigher portion of the cam 13 into engagement with the projection 12 ofthe bell crank 10. The resulting movement of the bell crank 10 lifts itsrearwardly extending arm off, the. pin 69 at the right-hand end of the.shaft 28. and a corresponding increase of separation of the feed rollers64 and 65 is then necessary before the right-hand pin 69 engages the.rearwardly extending arm of the bell crank 10 and before the shaft isconstrained to rock about the fulcrum for actuation of the switch; 9|.Whatever the setting of the double thickness adjustment, the factremains that due to the. distance of the left-hand end of the shaft 28from the fulcrum point being so much greater than the distance. of thefeed roller 65 from the same fulcrum point, the rise at the left-handend of the. shaft is much greater than any exces sive. documentthickness encountered between the feed rollers 64 and 65. Consequentlyan extremely sensitive control is provided which is so quick in. actionthat. only the leading edge ofv documents of a greater thickness thanthat for I which the control is set will engage. between feed and.control rolls 64 and 65 before the feed mechanism actually stops. Thisprovides for convenient manual removal of the documents at the top frontportion of the feed mechanism by the machine operator resulting in thefeed mechanism being restored to operation so the operator can againfeed the documents into the machine in proper order. The mechanismprevents the feeding of two or more documents simultaneously and alsothe feeding of documents that are folded or of a greater thickness thanis provided for by the setting of control knob '56. The controlmechanism may control the operation of the feed in any suitable mannersuch as just described and shown in either of the copending applicationshereinabove mentioned whether the feed of documents be manual ormechanical.

The invention claimed is:

1. In a document photographing machine, document feed means for feedingdocuments through a photographing position, drive means for oper atingsaid document feed means, and means for controlling operation of saiddocument feed means by said drive means having a shaft extendingtransversely to the direction of document feed, a document engagingmember mounted on said shaft intermediate the ends and engaging a partof said document feed means and movable away from said part by thethickness of a document, a support at one end of said shaft providing afulcrum for said shaft, and means movably supporting the opposite end ofsaid shaft for engaging and operating said controlling means forstopping the document feed when documents of greater than apredetermined thickness engage between said member and part.

2. In a document photographing machine, document feed means for feedinga document through a photographing position, drive means for operatingsaid document feed means, and means for controlling operation of saiddocument feed means by said drive means having a shaft extendingtransversely to the direction of document feed, a document engagingmember mounted on said shaft intermediate the ends and engaging a partof said document feed means and movable away from said part by thethickness of a document, bearings rotatably mounting said shaft atopposite ends, a support slidably mounting said bearings, means at oneend of said shaft for controlling slidable movement of said hearing toprovide a fulcrum for the movement of said shaft at one end thereof, andmeans operated by the bearing at the opposite end of said shaft foroperating said controlling means to stop the feed of documents whendocuments greater than a predetermined thickness engage between saidengaging member and said part.

3. In a document photographing machine, document feed means for feedinga document through a photographing position, drive means for operatingsaid document feed means, and means for controlling operation of saiddocument feed means by said drive means having a shaft extendingtransversely to the direction of document feed, a document engagingmember mounted on said shaft intermediate the ends and engaging a partof said document feed means and movable away from said part by thethickness of a document, bearings rotatably mounting said shaft atopposite ends, a support slidably mounting said bearings with oppositeends of said shaft for movement radially relative to said part of saidfeed means, slide members movable with said bearings and the ends ofsaid shaft on said support, a lever engaging one of said slide membersfor limiting sliding movement at one end of said shaft, means forholding said lever in adjusted position, and means operated by the slidemember at the opposite end of the shaft for operating said controllingmeans to stop document feed when documents exceeding a predeterminedthickness engage between said member and part.

4. In a document photographing machine, document feed means for feedinga document through a photographing position, drive means for operatingsaid document feed means, and means for controlling operation of saiddocument feed means by said drive means having a shaft extendingtransversely to the direction of document feed, a document engagingmember mounted on said shaft intermediate the ends and engaging a partof said document feed means and movable away from said part by thethickness of a document, bearings rotatably mounting said shaft atopposite ends, a support slidably mounting opposite ends of said shaftand bearings for movement radially relative to said part of said feedmeans, slide members movable with the ends of said shaft on saidsupport, a lever engaging one of said slide members for limiting slidingmovement at one end of said shaft, a cam rotatably mounted on saidsupport engaging said lever and operable for changing the position ofsaid lever, and means operated by the slide member at the opposite endof the shaft for operating said controlling means to stop document feedwhen documents exceeding the thickness for which said cam is set engagebetween said member and part.

5. In a document photographing machine, document feed means for feedinga document through a photographing position, drive means for operatingsaid document feed means, and a shaft for controlling operation of saiddocument feed means by said drive means, a document engaging membermounted on said shaft intermediate the ends and engaging a part of saiddocument feed means for document feeding cooperation therewith andmovable away from said part by the thickness of a document, meansrotatably mounting said shaft at opposite ends for sliding movementtoward and away from said document feed means, a fulcrum means for oneend of said shaft, a cam rotatably mounted on said mounting means andoperable to adjust said fulcrum means for said shaft, and means operatedby the opposite end of said shaft for operating said controlling meansto stop document feed when documents exceeding the thickness for whichsaid cam is set engage between said member and part.

6. In a document photographing machine, document feed means for feedingdocuments through a photographing position drive means for operatingsaid document feed means, operating control means for said document feedmeans including a shaft extending transversely to the direction ofdocument feed, a document-engaging member mounted on said shaftintermediate the ends and engaging a part of said document feed meansand movable away from said part by the thickness of a document, bearingsrotatably mounting said shaft at opposite ends, a support slidablymounting said bearings, means on one end of said shaft for controllingsliding movement of said bearings to provide a fulcrum for the movementof said shaft at one end thereof, and control means operated by theother end of said shaft responsive to the engagement of a documentexceeding a predetermined thickness between said document-engagingmember and said part of said document control means for moving said mem-9 her from contact with said part to stop feed of documents engaged withsaid part.

7. In a document photographing machine, document feed means for feedingdocuments through a photographing position, drive means for operatingsaid document feed means, and means for controlling operation of saiddocument feed means by said drive means having a yieldably mounted shaftextending transversely to the direction of document feed, a documentengaging member mounted on said shaft intermediate the ends thereof andengaging a part of said document feed means and movable away from saidpart by the thickness of the document, means limiting the yieldingmovement of one end of said shaft and control means operated by theamplified yielding of the other end of said shaft responsive toengagement of a document exceeding a predetermined thickness betweensaid document engaging member and said part of said document feed meansfor stopping document feed.

8. Sheet feeding means including drive means, feed means drivable bysaid drive means and cooperative to grip and feed sheet between them,control means for controlling said feed means by said drive means, and adocument engaging member engaging a part of said document feed means andmovable away from said part by the thickness of a document for operationof said control means to interrupt the feed when a sheet of greater thanpredetermined thickness is engaged between said part and said member,characterized by the fact that said document engaging member is mountedintermediate the ends of a yieldably mounted shaft selectively pivotalabout one end and having its other end operatively connected with saidcontrol means.

9. In a document photographing machine, document feed means for feedinga document through a photographing position and drive means foroperating said document feed means, the combination of means forcontrolling operation of said document feed means by said drive meanshaving a yieldably mounted shaft extending transversely to the directionof document feed, a document engaging roller mounted on said shaftintermediate the ends thereof rotatable by and in substantially pointcontact with a document engaged between said roller and a part of saiddocument feed means. said roller and said shaft therewith beingyieldably movable away from said part by the thickness of the document,means limiting the yielding movement of one end of said shaft controlmeans operated by the amplified yielding of the other end of said shaftresponsive to engagement of a document exceeding a predeterminedthickness between said roller and said part for stopping document feed,and thickness control adjustment means operable for adjusting theoperational relationship of said shaft with respect to said controlmeans for normally feeding documents of less than predeterminedthicknesses, with document straightening means comprising fingers spacedtransversely across the path of document feed and normally intersectingsaid path in advance of said photographing position, means mounting saidfingers for swinging out of said path about an axis transverse to thedirection of document feed, and resilient means resisting said swingingmovement of said fingers until all of said fingers are engaged by aleading edge of a document in said path, said resilient means beingoperatively connected between said thickness control adjustment meansand said fingers to increase resistance of said fingers to said swingingmovement in proportion to the thickness of documents engaged thereby.

FRIEDRICH J. SCHUTT.

REFERENCES orrnn The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,129,230 ONeil Sept. 6, 19382,196,741 Schubert Apr. 9, 1940

